Just browsing the app store on my iPod and found a rather good bike maintenance application. It's called bike repair, costs £1.99, gives seemingly clear and competent advice, covering a wide range of subjects. And if your like me and go to the bike shop whenever an inconvenient rattle occurs, it's certainly for you!!
Is it by Atomic Software or something? I was looking on the Android store for my HTC Sensation after seeing this and found an app called Bike Maintenance by Atomic Software if it's the same one?
For those without smartphones, or who wish to save £1.99 (don't all cyclists? ) there's always http://www.parktool.com/blog/repair-help - if you need more help than that can give you, you probably ought to be going to a bike shop!
I know how to do most stuff as over the years everything has broke on my bike , only things I won't touch is wheel truing, but it'd be a cool app still to have on the phone :p